Improvement in pressure-blowers



npr. STURTEVANT, or BOSTON, MASSACHUSETTS.

Letters Paare N0.- 92,489, daad July 13, 1869.

IMPROVEMENT IN PRESSURE-BLOWERS.

The Schedule referred to in these Letters Patent and making part 0f the same.

To all whom it may concern l Be it known that I, B. F. STURTEVANT, of Boston, in the county of Suiiolk, and State of Massachusetts, have invented an Improvement in Pressuredlowers;v and I do hereby declare that the following, taken in connection with. the drawings which accompany and form part of this specification, is 'a description of my invention sutlicient'to enable those skilled in the art to practise it.

AThis invention consists -iu the arrangement, within the case of a fan-pressure-blower, which receives and delivers air around its axis, of deflecting-plates or pa-rtitions, which extend between one side of the out-er case and a diaphragm-plate adjacent to-one sidevof the fan-wheel, from nearpthe central outlet-passage over the ends of the fan-blades, so as to intercept the air-currents as-they are thrown off tangentially from the ends of the fan-blades, and to changetheir direction of motion,`causing themto traverse in the channels formed between the side and periphery ofthe case andthe diaphragmgplate adjacent to the fan and the interposed deflecting-plates or partitions, from the periphery of the case to the central discharge outlet.

It consists also in combining, with such a blower, a blower having a tangential outlet Figure l, of the drawings, represents, in sectional elevation, a compound or multiplying pressure-blower,

embodying my invention, one part, a, ofthe casing of4 one ofthe compounded blowers being removed to exhibit the interior construction, which is-shown as looking from right to left of Figure 2, which is a vertical cross-section, taken in the plane of the axis of the blower-shaft, the section taken in iig. l being in the plane of the joint ofihe piece a, with the adjacent part of the blower-case.

But two blowers are shown in the drawings in combination, that number being suicient to illustrate the application of my invention to a compound blower, though it will be obvious that more than two might be combined by mere multiplication or duplication of the central delivery-blowers.

Besides the piece a, the case of the central deliveryblower, containing the partitions fi, is made up of a peripheral piece, c, and two sides, d and e, the latter piece, in the example shown, forming part of the vcase of an adjoining tangential delivery-blower, this case being composed of the continuation of (l, so as to form half of the periphery, the other half being the vpiece e, which is provided with a side,- f, having a central opening closed by the plate g, this blower being arranged to deliver air from the outlet h, in the direction of a tangent to the path described by the ends of the fans.

The space enclosed between the sides (l and e' of the central delivery-blower is considerably wider than is needed ibr the rotation of the fan-wheel in blowers which deliver air from a tangential outlet,land, as will be seen in fig. 1, the fan-wheel is 'locatedhear the head e, through a central aperture in which, the air enters to the fan-wheel, which being of a construction shown in patents previously granted me, will not be described herein, as not'eutenng into the essence of my present invention. v

Within the space between d and e, and adjacent to the side d, is a diaphragm, b, which makes substantially one boundary of the space in which the fan-wheel j revolves.

The diaphragm b is made, as shown, extending well over the ends of the fan-wheel blades, and in that part of b so extending, I out openings, marked k, through which the air thrown oi` by the fanescapes into the space bounded by the parts d, c, a, and b.

As the air enters 'this space, it strikes against the partitions, stops, or deflectors c', which extend acrossV it at intervals suited to the openings k.

The air on striking against the stops z',- is thereby deflected, and rushes through the channels formed by the partitions i, between the diaphragm b and -the blower-case to the central aperture in the head d, from which it may issue into a conduit, to be conducted in any direction or for any purpose, or it may, as shown in fig. 2, more especially, pass directly into an adjacent blower, at a central aperture in its side, which blower is constructed so as to deliver the air through the tangential outlet h. l

The air-currents are indicated in the drawings by red arrows, and the direction of rotation ofthe blower shaft by black arrows. p

Previous to my invention, blowers have been made to deliver the air from a central outlet by the use of partitions between the side of the blower-case and a diaphragm interposed between said side and the adjacent side of the fan-wheel, but such partitions, if.they extended to the outer corners of the fan-blades, did not extend over the ends of the blades, asv mine do, so that a large portion of l the power exerted in driving the fan-wheel was lost in propelling a current of' air aroundthe blower-case.

Now, by extending the partitions t', over the ends ot' the fans, all of the air thrown olf by them impinges at once against the described extensions of the partiv tions, and has its direction ot motion changed so as to pass toward and out of the central outlet.

I claim a central outlet-blower, having its dedectingplates extended over the ends of the fau-wheel blades, and between them and the blower-case, substantially as and for the purpose specied. v Also, a compounded blower, made up of one or more blowers, l1. ving central inlet and delivery-passages, diaphragms, and defiecting-plates, extending over theI tial delivery-blower, substantially as described.

f B; F. STURTEVANT.

\. Witnesses J. B. CROSBY,

.S. B. KIDDER.

ends oi' the fan-wheel blades, combined with a taugen 

